Thezz had a good appearance.
Thezz always tried to bully people of Houses lowest than his, but reluctantly obeyed those of higher-ranked Houses.
In 1479 DR, Thezz was among the people gathered to inspect the lost outpost of Sezz'ia, alongside priestesses Guannerrae Tlabbar, Myaral Tlabbar, and Iyelle Tlabbar, among others. However, Iyelle turned traitor and attacked her fellows, including Thezz, during a battle with some monsters.
Thezz survived without injuries, unlike the priestesses, so he became the spokesman of the group. He planned to go back to Menzoberranzan.